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Summary of Significant Accounting Policies - Customer Relationships and Acquisition Costs and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amortizable intangible assets
NET CARRYING AMOUNT	$ 1,326,977	$ 1,393,183
Amortization	204,507	201,878	$ 186,774
Included in Depreciation and Amortization
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years
2021	168,756
2022	139,983
2023	135,262
2024	130,298
2025	127,771
Thereafter	625,052
Customer relationship intangible assets
Amortizable intangible assets
GROSS CARRYING AMOUNT	1,852,700	1,751,848
ACCUMULATED AMORTIZATION	(668,547)	(544,721)
NET CARRYING AMOUNT	$ 1,184,153	1,207,127
Customer relationship intangible assets | Minimum
Amortizable intangible assets
Useful life of finite-lived intangible assets	10 years
Customer relationship intangible assets | Maximum
Amortizable intangible assets
Useful life of finite-lived intangible assets	30 years
Customer Inducements
Amortizable intangible assets
GROSS CARRYING AMOUNT	$ 49,098	52,718
ACCUMULATED AMORTIZATION	(26,923)	(29,397)
NET CARRYING AMOUNT	$ 22,175	23,321
Customer Inducements, Current Record Management Vendor Or Payments To Customers | Minimum
Amortizable intangible assets
Useful life of finite-lived intangible assets	1 year
Customer Inducements, Current Record Management Vendor Or Payments To Customers | Maximum
Amortizable intangible assets
Useful life of finite-lived intangible assets	10 years
Customer relationship intangible assets
Amortizable intangible assets
Amortization	$ 117,514	117,972	113,782
Data center in-place leases and tenant relationships
Amortizable intangible assets
Amortization	42,637	46,696	43,061
Data center lease-based intangible assets
Amortizable intangible assets
GROSS CARRYING AMOUNT	269,988	265,945
ACCUMULATED AMORTIZATION	(149,339)	(103,210)
NET CARRYING AMOUNT	120,649	162,735
GROSS CARRYING AMOUNT	12,854	12,750
ACCUMULATED AMORTIZATION	(5,943)	(3,937)
NET CARRYING AMOUNT	6,911	8,813
Third-party commissions asset and other finite-lived intangible assets
Amortizable intangible assets
GROSS CARRYING AMOUNT	34,317	31,708
ACCUMULATED AMORTIZATION	(8,761)	(4,134)
NET CARRYING AMOUNT	25,556	27,574
Amortization	7,004	7,957	5,713
Customer inducements and data center above-market and below-market leases
Amortizable intangible assets
Amortization	9,878	$ 13,703	$ 16,281
Customer inducements and data center above-market and below-market leases | Amortization Expense Charged To Revenues
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years
2021	7,603
2022	5,010
2023	3,084
2024	1,453
2025	508
Thereafter	$ 842

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